WCF 使用動態代理精簡代碼架構

時間  2020-12-22
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使用Castle.Core.dll實現，核心代碼是使用Castle.DynamicProxy.ProxyGenerator類的CreateInterfaceProxyWithoutTarget方法動態建立代理對象數據庫

NuGet上面Castle.Core的下載量1.78億之多緩存

 

1、重構前的項目代碼框架

    重構前的項目代碼共7層代碼，其中WCF服務端3層，WCF接口層1層，客戶端3層，共7層ide

    1.服務端WCF服務層SunCreate.InfoPlatform.Server.Service工具

    2.服務端數據庫訪問接口層SunCreate.InfoPlatform.Server.Bussiness性能

    3.服務端數據庫訪問實現層SunCreate.InfoPlatform.Server.Bussiness.Implui

    4.WCF接口層SunCreate.InfoPlatform.Contractspa

    5.客戶端代理層SunCreate.InfoPlatform.Client.Proxy3d

    6.客戶端業務接口層SunCreate.InfoPlatform.Client.Bussiness代理

    7.客戶端業務實現層SunCreate.InfoPlatform.Client.Bussiness.Impl

 

2、客戶端經過動態代理重構

    1.實如今攔截器中添加Ticket、處理異常、Close對象

    2.客戶端不須要再寫代理層代碼，而使用動態代理層

    3.對於簡單的增刪改查業務功能，也不須要再寫業務接口層和業務實現層，直接調用動態代理；對於複雜的業務功能以及緩存，才須要寫業務接口層和業務實現層

客戶端動態代理工廠類ProxyFactory代碼(該代碼目前寫在客戶端業務實現層)：

using Castle.DynamicProxy;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.ServiceModel;
using System.Text;
using System.Threading.Tasks;

namespace SunCreate.InfoPlatform.Client.Bussiness.Imp
{
    /// <summary>
    /// WCF服務工廠
    /// PF是ProxyFactory的簡寫
    /// </summary>
    public class PF
    {
        /// <summary>
        /// 攔截器緩存
        /// </summary>
        private static ConcurrentDictionary<Type, IInterceptor> _interceptors = new ConcurrentDictionary<Type, IInterceptor>();

        /// <summary>
        /// 代理對象緩存
        /// </summary>
        private static ConcurrentDictionary<Type, object> _objs = new ConcurrentDictionary<Type, object>();

        private static ProxyGenerator _proxyGenerator = new ProxyGenerator();

        /// <summary>
        /// 獲取WCF服務
        /// </summary>
        /// <typeparam name="T">WCF接口</typeparam>
        public static T Get<T>()
        {
            Type interfaceType = typeof(T);

            IInterceptor interceptor = _interceptors.GetOrAdd(interfaceType, type =>
            {
                string serviceName = interfaceType.Name.Substring(1); //服務名稱
                ChannelFactory<T> channelFactory = new ChannelFactory<T>(serviceName);
                return new ProxyInterceptor<T>(channelFactory);
            });

            return (T)_objs.GetOrAdd(interfaceType, type => _proxyGenerator.CreateInterfaceProxyWithoutTarget(interfaceType, interceptor)); //根據接口類型動態建立代理對象，接口沒有實現類
        }
    }
}
View Code

客戶端攔截器類ProxyInterceptor<T>代碼(該代碼目前寫在客戶端業務實現層)：

using Castle.DynamicProxy;
using log4net;
using SunCreate.Common.Base;
using SunCreate.InfoPlatform.Client.Bussiness;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Text;
using System.Threading.Tasks;

namespace SunCreate.InfoPlatform.Client.Bussiness.Imp
{
    /// <summary>
    /// 攔截器
    /// </summary>
    /// <typeparam name="T">接口</typeparam>
    public class ProxyInterceptor<T> : IInterceptor
    {
        private static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor<T>));

        private ChannelFactory<T> _channelFactory;

        public ProxyInterceptor(ChannelFactory<T> channelFactory)
        {
            _channelFactory = channelFactory;
        }

        /// <summary>
        /// 攔截方法
        /// </summary>
        public void Intercept(IInvocation invocation)
        {
            //準備參數
            ParameterInfo[] parameterInfoArr = invocation.Method.GetParameters();
            object[] valArr = new object[parameterInfoArr.Length];
            for (int i = 0; i < parameterInfoArr.Length; i++)
            {
                valArr[i] = invocation.GetArgumentValue(i);
            }

            //執行方法
            T server = _channelFactory.CreateChannel();
            using (OperationContextScope scope = new OperationContextScope(server as IContextChannel))
            {
                try
                {
                    HI.Get<ISecurityBussiness>().AddTicket();

                    invocation.ReturnValue = invocation.Method.Invoke(server, valArr);

                    var value = HI.Get<ISecurityBussiness>().GetValue();
                    ((IChannel)server).Close();
                }
                catch (Exception ex)
                {
                    _log.Error("ProxyInterceptor " + typeof(T).Name + " " + invocation.Method.Name + " 異常", ex);
                    ((IChannel)server).Abort();
                }
            }

            //out和ref參數處理
            for (int i = 0; i < parameterInfoArr.Length; i++)
            {
                ParameterInfo paramInfo = parameterInfoArr[i];
                if (paramInfo.IsOut || paramInfo.ParameterType.IsByRef)
                {
                    invocation.SetArgumentValue(i, valArr[i]);
                }
            }
        }
    }
}
View Code

如何使用：

List<EscortTask> list = PF.Get<IBussDataService>().GetEscortTaskList();
View Code

這裏不用再寫try catch，異常在攔截器中處理

 

3、WCF服務端經過動態代理，在攔截器中校驗Ticket、處理異常

服務端動態代理工廠類ProxyFactory代碼(代碼中保存動態代理dll不是必需的)：

using Autofac;
using Castle.DynamicProxy;
using Castle.DynamicProxy.Generators;
using SunCreate.Common.Base;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.ServiceModel;
using System.ServiceModel.Activation;
using System.Text;
using System.Threading.Tasks;

namespace SunCreate.InfoPlatform.WinService
{
    /// <summary>
    /// 動態代理工廠
    /// </summary>
    public class ProxyFactory
    {
        /// <summary>
        /// 攔截器緩存
        /// </summary>
        private static ConcurrentDictionary<Type, IInterceptor> _interceptors = new ConcurrentDictionary<Type, IInterceptor>();

        /// <summary>
        /// 代理對象緩存
        /// </summary>
        private static ConcurrentDictionary<Type, object> _objs = new ConcurrentDictionary<Type, object>();

        private static ProxyGenerator _proxyGenerator;

        private static ModuleScope _scope;

        private static ProxyGenerationOptions _options;

        static ProxyFactory()
        {
            AttributesToAvoidReplicating.Add(typeof(ServiceContractAttribute)); //動態代理類不繼承接口的ServiceContractAttribute

            String path = AppDomain.CurrentDomain.BaseDirectory;

            _scope = new ModuleScope(true, false,
                ModuleScope.DEFAULT_ASSEMBLY_NAME,
                Path.Combine(path, ModuleScope.DEFAULT_FILE_NAME),
                "MyDynamicProxy.Proxies",
                Path.Combine(path, "MyDymamicProxy.Proxies.dll"));
            var builder = new DefaultProxyBuilder(_scope);

            _options = new ProxyGenerationOptions();

            //給動態代理類添加AspNetCompatibilityRequirementsAttribute屬性
            PropertyInfo proInfoAspNet = typeof(AspNetCompatibilityRequirementsAttribute).GetProperty("RequirementsMode");
            CustomAttributeInfo customAttributeInfo = new CustomAttributeInfo(typeof(AspNetCompatibilityRequirementsAttribute).GetConstructor(new Type[0]), new object[0], new PropertyInfo[] { proInfoAspNet }, new object[] { AspNetCompatibilityRequirementsMode.Allowed });
            _options.AdditionalAttributes.Add(customAttributeInfo);

            //給動態代理類添加ServiceBehaviorAttribute屬性
            PropertyInfo proInfoInstanceContextMode = typeof(ServiceBehaviorAttribute).GetProperty("InstanceContextMode");
            PropertyInfo proInfoConcurrencyMode = typeof(ServiceBehaviorAttribute).GetProperty("ConcurrencyMode");
            customAttributeInfo = new CustomAttributeInfo(typeof(ServiceBehaviorAttribute).GetConstructor(new Type[0]), new object[0], new PropertyInfo[] { proInfoInstanceContextMode, proInfoConcurrencyMode }, new object[] { InstanceContextMode.Single, ConcurrencyMode.Multiple });
            _options.AdditionalAttributes.Add(customAttributeInfo);

            _proxyGenerator = new ProxyGenerator(builder);
        }

        /// <summary>
        /// 動態建立代理
        /// </summary>
        public static object CreateProxy(Type contractInterfaceType, Type impInterfaceType)
        {
            IInterceptor interceptor = _interceptors.GetOrAdd(impInterfaceType, type =>
            {
                object _impl = HI.Provider.GetService(impInterfaceType);
                return new ProxyInterceptor(_impl);
            });

            return _objs.GetOrAdd(contractInterfaceType, type => _proxyGenerator.CreateInterfaceProxyWithoutTarget(contractInterfaceType, _options, interceptor)); //根據接口類型動態建立代理對象，接口沒有實現類
        }

        /// <summary>
        /// 保存動態代理dll
        /// </summary>
        public static void Save()
        {
            string filePath = Path.Combine(_scope.WeakNamedModuleDirectory, _scope.WeakNamedModuleName);
            if (File.Exists(filePath))
            {
                File.Delete(filePath);
            }
            _scope.SaveAssembly(false);
        }
    }
}
View Code

說明：object _impl = HI.Provider.GetService(impInterfaceType); 這句代碼用於建立數據庫訪問層對象，HI是項目中的一個工具類，相似Autofac框架的功能

服務端攔截器類ProxyInterceptor<T>代碼：

using Castle.DynamicProxy;
using log4net;
using SunCreate.Common.Base;
using SunCreate.InfoPlatform.Server.Bussiness;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Text;
using System.Threading.Tasks;

namespace SunCreate.InfoPlatform.WinService
{
    /// <summary>
    /// 攔截器
    /// </summary>
    public class ProxyInterceptor : IInterceptor
    {
        private static ILog _log = LogManager.GetLogger(typeof(ProxyInterceptor));

        private object _impl;

        public ProxyInterceptor(object impl)
        {
            _impl = impl;
        }

        /// <summary>
        /// 攔截方法
        /// </summary>
        public void Intercept(IInvocation invocation)
        {
            //準備參數
            ParameterInfo[] parameterInfoArr = invocation.Method.GetParameters();
            object[] valArr = new object[parameterInfoArr.Length];
            for (int i = 0; i < parameterInfoArr.Length; i++)
            {
                valArr[i] = invocation.GetArgumentValue(i);
            }

            //執行方法
            try
            {
                if (HI.Get<ISecurityImp>().CheckTicket())
                {
                    Type implType = _impl.GetType();
                    MethodInfo methodInfo = implType.GetMethod(invocation.Method.Name);
                    invocation.ReturnValue = methodInfo.Invoke(_impl, valArr);
                }
            }
            catch (Exception ex)
            {
                _log.Error("ProxyInterceptor " + invocation.TargetType.Name + " " + invocation.Method.Name + " 異常", ex);
            }

            //out和ref參數處理
            for (int i = 0; i < parameterInfoArr.Length; i++)
            {
                ParameterInfo paramInfo = parameterInfoArr[i];
                if (paramInfo.IsOut || paramInfo.ParameterType.IsByRef)
                {
                    invocation.SetArgumentValue(i, valArr[i]);
                }
            }
        }
    }
}
View Code

服務端WCF的ServiceHost工廠類：

using Spring.ServiceModel.Activation;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.ServiceModel;
using System.Text;
using System.Threading.Tasks;

namespace SunCreate.InfoPlatform.WinService
{
    public class MyServiceHostFactory : ServiceHostFactory
    {
        public MyServiceHostFactory() { }

        public override ServiceHostBase CreateServiceHost(string reference, Uri[] baseAddresses)
        {
            Assembly contractAssembly = Assembly.GetAssembly(typeof(SunCreate.InfoPlatform.Contract.IBaseDataService));
            Assembly impAssembly = Assembly.GetAssembly(typeof(SunCreate.InfoPlatform.Server.Bussiness.IBaseDataImp));
            Type contractInterfaceType = contractAssembly.GetType("SunCreate.InfoPlatform.Contract.I" + reference);
            Type impInterfaceType = impAssembly.GetType("SunCreate.InfoPlatform.Server.Bussiness.I" + reference.Replace("Service", "Imp"));
            if (contractInterfaceType != null && impInterfaceType != null)
            {
                var proxy = ProxyFactory.CreateProxy(contractInterfaceType, impInterfaceType);
                ServiceHostBase host = new ServiceHost(proxy, baseAddresses);
                return host;
            }
            else
            {
                return null;
            }
        }
    }
}
View Code

svc文件配置ServiceHost工廠類：

<%@ ServiceHost Language="C#" Debug="true"  Service="BaseDataService"  Factory="SunCreate.InfoPlatform.WinService.MyServiceHostFactory" %>

如何使用自定義的ServiceHost工廠類啓動WCF服務，下面是部分代碼：

MyServiceHostFactory factory = new MyServiceHostFactory();
List<ServiceHostBase> hostList = new List<ServiceHostBase>();
foreach (var oFile in dirInfo.GetFiles())
{
    try
    {
        string strSerName = oFile.Name.Replace(oFile.Extension, "");
        string strUrl = string.Format(m_strBaseUrl, m_serverPort, oFile.Name);
        var host = factory.CreateServiceHost(strSerName, new Uri[] { new Uri(strUrl) });
        if (host != null)
        {
            hostList.Add(host);
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine("出現異常：" + ex.Message);
        m_log.ErrorFormat(ex.Message + ex.StackTrace);
    }
}
ProxyFactory.Save();
foreach (var host in hostList)
{
    try
    {
        foreach (var endpoint in host.Description.Endpoints)
        {
            endpoint.EndpointBehaviors.Add(new MyEndPointBehavior()); //用於添加消息攔截器、全局異常攔截器
        }
        host.Open();
        m_lsHost.TryAdd(host);
    }
    catch (Exception ex)
    {
        Console.WriteLine("出現異常：" + ex.Message);
        m_log.ErrorFormat(ex.Message + ex.StackTrace);
    }
}
View Code

WCF服務端不再用寫Service層了 

 

4、當我須要添加一個WCF接口，以實現一個查詢功能，好比查詢全部組織機構，重構前，我須要在7層添加代碼，而後客戶端調用，重構後，我只須要在3層添加代碼，而後客戶端調用

    1.在WCF接口層添加接口

    2.在服務端數據訪問接口層添加接口

    3.在服務端數據訪問實現層添加實現方法

    4.客戶端調用：var orgList = PF.Get<IBaseDataService>().GetOrgList();

    重構前，須要在7層添加代碼，雖然每層代碼都差很少，能夠複製粘貼，可是複製粘貼也很麻煩啊，重構後省事多了，今後不再怕寫增刪改查了

 

5、性能損失

主要是invocation.Method.Invoke比直接調用慢，耗時是直接調用的二、3倍，可是多花費的時間跟數據庫查詢耗時比起來，是微不足道的

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